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Business Segment Information - Schedule of Business Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Net sales:        
Total net sales $ 26,505 $ 26,473 $ 83,314 $ 79,102
Operating income (loss):        
Total operating income 3,434 3,432 11,441 10,632
Interest income 16 7 32 19
Income before taxes 3,450 3,439 11,473 10,651
Operating Segments | Security Products        
Net sales:        
Total net sales 23,115 23,237 72,831 69,246
Operating income (loss):        
Total operating income 4,455 4,694 14,656 14,235
Operating Segments | Marine Components        
Net sales:        
Total net sales 3,390 3,236 10,483 9,856
Operating income (loss):        
Total operating income 422 223 1,288 729
Corporate        
Operating income (loss):        
Total operating income $ (1,443) $ (1,485) $ (4,503) $ (4,332)